Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.

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Region	CAMS	Morning							CAMS	POC	Entity
Ozone Hourly Averages for Thursday, September 21, 2023. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	6:00	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	54	47	40	35	31	27	NA	13	2 ^R ^MDL	TCEQ
	17	51	50	43	37	31	26	FEW	17	2 ^R ^MDL	TCEQ
	31	45	46	46	43	38	33	FEW	31	1 ^R ^MDL	TCEQ
	56	PMA	PMA	PMA	PMA	PMA	PMA	PMA	56	1 ^R ^MDL	TCEQ
	63	45	44	41	37	31	26	FEW	63	1 ^R ^MDL	TCEQ
	69 ¹	38	38	35	31	26	22	FEW	69 ¹	1 ^R ^MDL	Other Gov
	70	44	44	40	37	31	22	FEW	70	1 ^R ^MDL	TCEQ
	71	44	42	37	31	27	20	FEW	71	1 ^R ^MDL	TCEQ
	73	46	42	37	33	28	26	FEW	73	1 ^R ^MDL	TCEQ
	75 ²	52	50	42	37	33	30	FEW	75 ²	1 ^R ^MDL	TCEQ
	76	44	42	36	32	29	26	FEW	76	1 ^R ^MDL	TCEQ
	77	46	42	37	34	30	27	FEW	77	1 ^R ^MDL	TCEQ
	401 ³	40	33	32	26	19	12	FEW	401 ³	3 ^R ^MDL	Other Gov
	402 ¹	45	46	46	42	36	28	FEW	402 ¹	1 ^R ^MDL	Other Gov
	1006	42	37	31	27	23	20	FEW	1006	1 ^R ^MDL	TCEQ
	1032	33	29	28	41	35	19	FEW	1032	1 ^R ^MDL	TCEQ
	1044	51	45	39	32	28	23	FEW	1044	1 ^R ^MDL	TCEQ
	1051	35	32	31	26	21	15	FEW	1051	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by the City of Dallas. ²- These sites are maintained and operated by AECOM for North Texas Commission (NTC). ³- These sites are maintained and operated by the City of Dallas (Met NOx O3 SO2 CO). TCEQ does not certify the validity or quality of data it hosts from other monitoring entities.
		Maximum values for the day are bold within the table. Minimum values are *bold italic*.
		^R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.

Texas Commission on Environmental Quality

Ozone Hourly Averages